16649087438 has 4 divisors (see below), whose sum is σ = 24973631160. Its totient is φ = 8324543718.

The previous prime is 16649087417. The next prime is 16649087449. The reversal of 16649087438 is 83478094661.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×16649087438² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4162271858 + ... + 4162271861.

It is an arithmetic number, because the mean of its divisors is an integer number (6243407790).

Almost surely, 2^16649087438 is an apocalyptic number.

16649087438 is a deficient number, since it is larger than the sum of its proper divisors (8324543722).

16649087438 is an equidigital number, since it uses as much as digits as its factorization.

16649087438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8324543721.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 16649087438 in words is "sixteen billion, six hundred forty-nine million, eighty-seven thousand, four hundred thirty-eight".